Earlier quoted context omitted.
I worked in this space, and yes, if the employer offers an incentive, people will cheat. Even for something like a $10 Dunkin Donuts gift card (heck of a incentive for a health/wellness program). We'd go through logs and see people sequentially logging for each day, one team member after another, on the last day of the competition. You'd also find people scrutinizing the accuracy of any reporting we did as a company…
Donuts as a reward for physical activity - what the actual??
A lot of their speciality drinks are basically milkshakes though.